We also have same unit but a'm finding it to be not be very effective, even when setting is on 9. Have also pulled breakaway when sitting and the motor home on an idle will pull car with very little drag.When this tried the peddle in the car was pushing as it should. Maybe this Enclave takes more force than other cars under a no vaccuum condition. Blue Ox has replaced the unit once , but new one dosen't seem to be much better. Has anyone tried one on a Buick Enclave?
2010 tuscany 4051 425 ISL
2015 Buick Enclave Dianne & Gerald.